Spatial and Energy Distribution of Topological Edge States in Single Bi(111) Bilayer

Fu, Yang; Miao, Lin; Wang, Z. F.; Yao, Mengyu; Zhu, Fengfeng; Song, Y. R.; Wang, Meixiao; Xu, Junfeng; Федоров, А. В.; Sun, Zhe; Zhang, G. B.; Liu, Canhua; Liu, Feng; Qian, Dong; Gao, Chunlei; Jia, Jin‐Feng

doi:10.1103/physrevlett.109.016801

Cited by 309 publications

(281 citation statements)

References 25 publications

(16 reference statements)

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“…On the other hand, a very recent scanning tunneling microscopy (STM) and STS study claimed that the edge-localized density of states (DOS) of a Bi(111) BL island were resolved. 22 However, the DOS enhancement itself was marginal and the corresponding energy was not clearly separated from other spectral features nor consistent with the calculation based on a freestanding Bi layer. More importantly, a strong hybridization of the electronic bands of the Bi BL and the substrate, Bi 2 Te 3 , was observed in both ARPES and first-principles calculations to drive the BL apparently metallic.…”

Section: 13supporting

confidence: 71%

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Edge and interfacial states in a two-dimensional topological insulator: Bi(111) bilayer onBi2Te2Se

et al. 2014

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The electronic states of a single Bi(111) bilayer and its edges, suggested as a two dimensional topological insulator, are investigated by scanning tunneling spectroscopy (STS) and first-principles calculations. Well-ordered bilayer films and islands with zigzag edges are grown epitaxially on a cleaved Bi2Te2Se crystal. The calculation shows that the band gap of the Bi bilayer closes with a formation of a new but small hybridization gap due to the strong interaction between Bi and Bi2Te2Se. Nevertheless, the topological nature of the Bi bilayer and the topological edge state are preserved only with an energy shift. The edge-enhanced local density of states are identified and visualized clearly by STS in good agreement with the calculation. This can be the sign of the topological edge state, which corresponds to the quantum spin Hall state. The interfacial state between Bi and Bi2Te2Se is also identified inside the band gap region. This state also exhibits the edge modulation, which was previously interpreted as the evidence of the topological edge state [F. Yang et al., Phys. Rev. Lett. 109, 016801 (2012)].

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Section: 13supporting

confidence: 71%

“…More importantly, a strong hybridization of the electronic bands of the Bi BL and the substrate, Bi 2 Te 3 , was observed in both ARPES and first-principles calculations to drive the BL apparently metallic. 19,20,22,23 Therefore, the TI nature of the Bi BL film grown on Bi 2 Te 3 is not clear at present.…”

Section: 13mentioning

confidence: 98%

Edge and interfacial states in a two-dimensional topological insulator: Bi(111) bilayer onBi2Te2Se

et al. 2014

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“…E dge states emerging at the symmetry breaking boundaries are not only highly intriguing from fundamental physics point of view but also very promising for next-generation electronic devices, which have been already studied intensely in topological insulators 1,2 and graphene ribbons [3][4][5] . However, to date, there have been no reports on the existence of edge states in strongly correlated oxides.…”

mentioning

confidence: 99%

Visualization of a ferromagnetic metallic edge state in manganite strips

Zhang

Dong

et al. 2015

Nat Commun

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Recently, broken symmetry effect induced edge states in two-dimensional electronic systems have attracted great attention. However, whether edge states may exist in strongly correlated oxides is not yet known. In this work, using perovskite manganites as prototype systems, we demonstrate that edge states do exist in strongly correlated oxides. Distinct appearance of ferromagnetic metallic phase is observed along the edge of manganite strips by magnetic force microscopy. The edge states have strong influence on the transport properties of the strips, leading to higher metal-insulator transition temperatures and lower resistivity in narrower strips. Model calculations show that the edge states are associated with the broken symmetry effect of the antiferromagnetic charge-ordered states in manganites. Besides providing a new understanding of the broken symmetry effect in complex oxides, our discoveries indicate that novel edge state physics may exist in strongly correlated oxides beyond the current two-dimensional electronic systems.

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“…Subsequently, several binary (Bi 2 Te 3 , Bi 2 Se 3 and Sb 2 Te 3 ) [7][8][9][10] , ternary (TlBiTe 2 , TlBiSe 2 and PbBi 2 Te 4 ) [11][12][13] and Heusler compounds [14][15][16] have been found to be three-dimensional (3D) TIs. Most recently, the Bi bilayer [17][18][19][20][21] and actinide-based binary compounds 22 have been predicted to be new families of 2D and 3D TIs, respectively. However, these existing families of TIs are all inorganic materials.…”

mentioning

confidence: 99%

Organic topological insulators in organometallic lattices

2013

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Topological insulators are a recently discovered class of materials having insulating bulk electronic states but conducting boundary states distinguished by nontrivial topology. So far, several generations of topological insulators have been theoretically predicted and experimentally confirmed, all based on inorganic materials. Here, based on first-principles calculations, we predict a family of two-dimensional organic topological insulators made of organometallic lattices. Designed by assembling molecular building blocks of triphenyl-metal compounds with strong spin-orbit coupling into a hexagonal lattice, this new classes of organic topological insulators are shown to exhibit nontrivial topological edge states that are robust against significant lattice strain. We envision that organic topological insulators will greatly broaden the scientific and technological impact of topological insulators.

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Spatial and Energy Distribution of Topological Edge States in Single Bi(111) Bilayer

Cited by 309 publications

References 25 publications

Edge and interfacial states in a two-dimensional topological insulator: Bi(111) bilayer onBi2Te2Se

Edge and interfacial states in a two-dimensional topological insulator: Bi(111) bilayer onBi2Te2Se

Visualization of a ferromagnetic metallic edge state in manganite strips

Organic topological insulators in organometallic lattices

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